Research Supporting the Development of Guidelines for Implementing Managed Lanes

Numerous domestic and international agencies either have constructed or are planning managed lanes; each facility is unique and presents issues and challenges because these facilities are often implemented in high-demand, congested, or constrained corridors. There has been no singular guidance to assist transportation agencies implementing managed lanes; various guides contain some information on managed lanes, but they do not explicitly address the wide range of issues and complexity associated with managed lanes in sufficient detail to serve as a national guide on the subject. The objective of NCHRP Project 15-49 was to develop guidelines for the planning, design, operations, and maintenance of managed lanes. The final product—Guidelines for Implementing Managed Lanes—will become the primary reference on managed lanes and complement other national guidelines. It was designed to be applicable to practitioners at all levels of experience with managed lanes and to be used to support informed decision-making. The scope of this project was limited to managed lanes on freeways and expressways. In Phase I of this project, the research team compiled existing information from published literature and existing manuals and policy documents, emphasizing sources published in the last 10 years. Researchers also discussed current practices with practitioners in group and individual settings to document guidance needs that the practitioners identified. Using information obtained in these activities, in Phase II, the research team conducted a series of focused studies to fill identified knowledge gaps on design decision-making, trade-offs of geometric design elements, access design, and factors that affect speed on managed lanes. The activities and findings of the research team on those tasks, along with potential research needs and suggested changes to existing reference documents, are documented in this report and its appendices. The final version of the guidelines is published as a stand-alone document to facilitate its dissemination and use within the profession.

  • Record URL:
  • Authors:
    • Fitzpatrick, Kay
    • Brewer, Marcus
    • Lindheimer, Tomas
    • Chrysler, Susan
    • Avelar, Raul
    • Wood, Nick
    • Ungemah, David
    • Swenson, Chris
    • Fuhs, Chuck
  • Publication Date: 2016-5


  • English

Media Info

  • Media Type: Web
  • Features: Appendices; Figures; Tables;
  • Pagination: 344p
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01627488
  • Record Type: Publication
  • Report/Paper Numbers: NCHRP Project 15-49
  • Files: TRIS, TRB, ATRI
  • Created Date: Feb 27 2017 10:32AM